Fix operation test fail

CI fail: https://gitlab.syncad.com/hive/hive/-/jobs/670487

This failure occurred in the operation tests group -> power-up tests (transfer_to_vesting_operation). One of the tested behaviors in this group is to verify the correctness of generating a virtual operation ( transfer_to_vesting_completed_operation ) - this virtual operation is generated while the price hive_to_vest stabilizes. The fix consists moving price stabilization closer to the genesis block, which results in generating a virtual operation before block 10. (below the lower limit for checking these virtual operations in tests). Additionally, the lower vop reading limit has been changed to block 30